66728332567 has 16 divisors (see below), whose sum is σ = 74899621888. Its totient is φ = 59029676640.

The previous prime is 66728332549. The next prime is 66728332571. The reversal of 66728332567 is 76523382766.

66728332567 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66728332567 - 2²³ = 66719943959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66728332547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762273 + ... + 845290.

It is an arithmetic number, because the mean of its divisors is an integer number (4681226368).

Almost surely, 2^66728332567 is an apocalyptic number.

66728332567 is a deficient number, since it is larger than the sum of its proper divisors (8171289321).

66728332567 is a wasteful number, since it uses less digits than its factorization.

66728332567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607710.

The product of its digits is 15240960, while the sum is 55.

The spelling of 66728332567 in words is "sixty-six billion, seven hundred twenty-eight million, three hundred thirty-two thousand, five hundred sixty-seven".